gdb/mips-netbsd-nat.c

   1 /* Native-dependent code for MIPS systems running NetBSD.
   2
   3    Copyright (C) 2000-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* We define this to get types like register_t.  */
  21 #define _KERNTYPES
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #include "mips-tdep.h"
  32 #include "mips-netbsd-tdep.h"
  33 #include "netbsd-nat.h"
  34 #include "inf-ptrace.h"
  35
  36 class mips_nbsd_nat_target final : public nbsd_nat_target
  37 {
  38   void fetch_registers (struct regcache *, int) override;
  39   void store_registers (struct regcache *, int) override;
  40 };
  41
  42 static mips_nbsd_nat_target the_mips_nbsd_nat_target;
  43
  44 /* Determine if PT_GETREGS fetches this register.  */
  45 static int
  46 getregs_supplies (struct gdbarch *gdbarch, int regno)
  47 {
  48   return ((regno) >= MIPS_ZERO_REGNUM
  49           && (regno) <= gdbarch_pc_regnum (gdbarch));
  50 }
  51
  52 void
  53 mips_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  54 {
  55   pid_t pid = regcache->ptid ().pid ();
  56
  57   struct gdbarch *gdbarch = regcache->arch ();
  58   if (regno == -1 || getregs_supplies (gdbarch, regno))
  59     {
  60       struct reg regs;
  61
  62       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  63         perror_with_name (_("Couldn't get registers"));
  64
  65       mipsnbsd_supply_reg (regcache, (char *) &regs, regno);
  66       if (regno != -1)
  67         return;
  68     }
  69
  70   if (regno == -1
  71       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
  72     {
  73       struct fpreg fpregs;
  74
  75       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  76         perror_with_name (_("Couldn't get floating point status"));
  77
  78       mipsnbsd_supply_fpreg (regcache, (char *) &fpregs, regno);
  79     }
  80 }
  81
  82 void
  83 mips_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
  84 {
  85   pid_t pid = regcache->ptid ().pid ();
  86
  87   struct gdbarch *gdbarch = regcache->arch ();
  88   if (regno == -1 || getregs_supplies (gdbarch, regno))
  89     {
  90       struct reg regs;
  91
  92       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  93         perror_with_name (_("Couldn't get registers"));
  94
  95       mipsnbsd_fill_reg (regcache, (char *) &regs, regno);
  96
  97       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  98         perror_with_name (_("Couldn't write registers"));
  99
 100       if (regno != -1)
 101         return;
 102     }
 103
 104   if (regno == -1
 105       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 106     {
 107       struct fpreg fpregs;
 108
 109       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 110         perror_with_name (_("Couldn't get floating point status"));
 111
 112       mipsnbsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 113
 114       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 115         perror_with_name (_("Couldn't write floating point status"));
 116     }
 117 }
 118
 119 void _initialize_mipsnbsd_nat ();
 120 void
 121 _initialize_mipsnbsd_nat ()
 122 {
 123   add_inf_child_target (&the_mips_nbsd_nat_target);
 124 }